Seventeen-year-old Claire Williams’ tough upbringing has taught her how to throw a punch or two to survive, especially when it involves a man’s unwanted attention. But her strength waivers when she visits Bodian Dynamics, a medical research facility, and stumbles upon classified information—someone has stolen a drug that not only changes a person's appearance, but will also unleash a dark and evil alter ego.

After an intimidating security guard threatens the lives of her friends if she speaks to anyone about the incident, Claire pretends the drug never existed. That is until she meets Gage, a teenage boy who doesn’t seem to have a conscience and who is hell-bent on making her just like him by unleashing her dark side.

But Claire knows a secret—he can only die while in his normal state. And since Gage knows personal information about her, Claire thinks she knows who it is: either her best friend or her recent boyfriend. And once she figures out which boy Gage is hiding behind, she’s going to kill him, even if it breaks her heart.